L-theanine: amino acid from tea and supplements

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L-theanine is an amino acid found almost exclusively in tea leaves (Camellia sinensis), where it contributes to the mild, “umami” flavour of the brew. It is not one of the amino acids that make up proteins, and it is available in supplements as capsules or gummies.

Discover the origin of theanine, its forms and our selection.

L-theanine: amino acid from tea and supplements | NATURAMedicatrix

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Neuro-AD Concentration

60 vegetable capsules

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Neuro-AD Gummies (Strawberry & Raspberry)

60 gummies

€24.90

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Théanine Activ'

60 capsules

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Active ingredients guide

L-theanine: the amino acid in tea leaves

L-theanine is an amino acid produced by the tea plant (Camellia sinensis). It is formed in the roots of the plant, then accumulates in the young leaves. It is one of the compounds that give tea its mild, rounded flavour, close to what the Japanese call umami.

It was identified in 1949 in Japan, in the leaves of gyokuro green tea. Unlike most amino acids, it is not part of the make-up of proteins: it is referred to as a “free” amino acid. Apart from tea, it is found in very few organisms, such as a mushroom, the bay bolete.

Specific to tea

The tea plant is its almost exclusive natural source.

Discovered in 1949

By Japanese researchers, in gyokuro tea.

Umami flavour

It softens the bitterness of tea catechins.

The molecule

Theanine, L-theanine: what are we talking about?

Chemically, theanine is a derivative of glutamic acid. It exists in two mirror-image forms:

L-theanine

The natural form, the one made by the tea plant and sought in supplements.

D-theanine

Its mirror form, rarely found in nature. A mixture of the two is called DL-theanine.

Sources and forms

Where is L-theanine found?

All teas made from Camellia sinensis contain it: green, black, white or oolong. The highest levels are found in shade-grown teas, such as gyokuro and matcha: sheltered from the light, the leaf converts less of its theanine into catechins. Young shoots are also richer in it than older leaves. Herbal infusions (rooibos, chamomile…) contain none.

In supplements, L-theanine is available as capsules, powder or gummies. It may come from a green tea extract standardised for L-theanine, or be produced by an enzymatic process. It is often combined with vitamins, magnesium or plants.

What research says

L-theanine: where does the science stand?

L-theanine is widely studied, particularly in Japan. Researchers are interested in its biosynthesis in the tea plant, in the influence of shade growing on its content, in its role in the taste of tea, and in how the body absorbs and eliminates it.

To date, no health claim relating to L-theanine is authorised in the European Union. This research therefore does not allow any particular effect to be attributed to a food supplement containing it. During pregnancy and breastfeeding, or if you are taking medication, ask your doctor for advice.

Buying guide

How to choose an L-theanine supplement?

The actual dose

For a tea extract, look at the amount of pure L-theanine, not the weight of extract.

The L form

The label should specify L-theanine, the natural form found in tea.

Capsule or gummy

A vegetable capsule, or a chewable gummy: in that case, check the sweeteners and flavourings.

Alone or combined

With B vitamins, magnesium or plants, depending on the formula.

Our selection

Our L-theanine supplements

As capsules or gummies, alone or combined: here are our three formulas containing L-theanine.

Théanine activ’ — 60 capsules

A green tea extract standardised to 40%: 100 mg of L-theanine per capsule, up to 400 mg for 4 capsules, with biotin.

Discover Théanine activ’ →

Neuro-AD Concentration — 60 vegetable capsules

400 mg of L-theanine per 4 capsules, with bacopa, passionflower, magnesium, zinc and B vitamins.

Discover Neuro-AD Concentration →

Neuro-AD Gummies — 60 gummies

200 mg of L-theanine per 4 strawberry and raspberry gummies, with bacopa, zinc and eight B vitamins.

Discover Neuro-AD Gummies →

Frequently asked questions

L-theanine FAQ

What is L-theanine?

A free amino acid produced by the tea plant and present in all tea leaves. It contributes to the mild, umami taste of the brew.

Are there L-theanine gummies?

Yes. Neuro-AD Gummies provides 200 mg of L-theanine per 4 gummies, the same as 2 capsules of Neuro-AD Concentration.

Is L-theanine plant-derived?

In nature, it comes from tea. Some supplements, such as Théanine activ’, use a green tea extract; others use L-theanine obtained by an enzymatic process. Read the list of ingredients.

Does a cup of tea provide as much as a capsule?

No. The content of a cup varies greatly depending on the tea and how it is brewed, but it remains well below the amounts provided by a dosed capsule.

Where can I buy L-theanine?

In organic shops, pharmacies or online. At NATURAMedicatrix, L-theanine is available in green tea extract capsules and in combined formulas, as capsules or gummies.

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9772 Troine (Wincrange)
Luxembourg
Call us: +33977423704
Email us:

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Theanine

Neuro-AD Concentration

Neuro-AD Gummies (Strawberry & Raspberry)

Théanine Activ'

L-theanine: the amino acid in tea leaves

Theanine, L-theanine: what are we talking about?

L-theanine

D-theanine

Where is L-theanine found?

L-theanine: where does the science stand?

How to choose an L-theanine supplement?

The actual dose

The L form

Capsule or gummy

Alone or combined

Our L-theanine supplements

Théanine activ’ — 60 capsules

Neuro-AD Concentration — 60 vegetable capsules

Neuro-AD Gummies — 60 gummies

L-theanine FAQ

What is L-theanine?

Are there L-theanine gummies?

Is L-theanine plant-derived?

Does a cup of tea provide as much as a capsule?

Where can I buy L-theanine?

Nos actifs incontournables